DJ6SI, DJ3NG, DJ4EI, DF6FK and
ship crew were on their way to the Spratly Island DXpedition. A
night before arriving at Spratly, their boat was attacked and
sunken by Vietnamese gunships on Amboyna Cay.
DJ6SI survived and issued this QSL to mourn DJ3NG, DJ4EI, and
others killed by this incident.

Here is the short story:

The first shot fell short, but the next shot
struck the captain and he threw himself on the floor, although
bleeding badly, as he tried to keep the ship on course. Baldur
was also hit in the arm, and was bleeding, as was Norbert. Gero
was in contact with another station on 20 meters, and advised him
that they were under attack. As Gero left his position, they
noticed that Diethelm was missing. It was not actually known if
he was shot or thrown overboard. Their dinghy had fallen into the
water, and everyone climbed into it, while the boat burned. The
shelling continued, as they drifted farther away from the island.
They had hoped that the message Gero had sent out on 20 meters
had been received okay, and they would be rescued by U.S. Air
Force planes in a few days. They believed that the Vietcong had
shelled them, and soon discovered their dinghy had also been hit,
but they were able to plug the hole with cloth. The bad news was
that they had no water, and nothing to eat, and all were only
partially clothed with no shoes. They used a small basket to
catch tiny fish, which they ate, along with a few mussels from
the bottom of the dinghy, but still no water. After about eight
days, Gero tried drinking some sea water during the night, and he
was dead by morning. They buried him at sea. Since the Spratly
Group consists of so many reefs, sandbars and shallow areas,
there is very little shipping nearby, so they had to wait until
they got close to the shipping lanes for any hope of rescue.
Everyone was suffering terribly from thirst - there was little
hunger. The skipper and Norbert were both in bad condition, and
everyones hope centered on a vision Baldur had had a few
nights before, when he believed he heard a voice calling through
dense fog: On the tenth day you will be rescued.
(which later became the title of Baldurs book) After
several ships passed, indeed on the tenth day (April 19) they
were finally spotted by a Japanese ship, the freighter
Linden under Captain Inose. On arriving in Hong Kong,
they were taken to a hospital, where they recovered from their
ordeal at sea.